Surveillance apparatus and method for the detection of radio rec

Details Surveillance apparatus and method for the detection of radio rec Surveillance apparatus and method for the detection of radio rec

1976-09-22

2000-04-11

Sotomayor, John B.

Communications: directive radio wave systems and devices (e.g.,

Radar ew

342 20, 342 90, 342 97, 342107, 342140, 342 99, G01S 1306, G01S 1366

Patent

active

060493011

ABSTRACT:
Method and apparatus for the detection of a target receiver unit such as an enemy radar or radio receiver is disclosed. The surveillance system of this invention includes a transmitter unit coupled to an antenna to establish an electromagnetic surveillance field that includes signal components at two predetermined surveillance frequencies. When a target receiver is located within the surveillance field, the target receiver produces a second electromagnetic field having signal components at the intermodulation products of the surveillance field signal components due to a nonlinear mixing process that occurs within the target receiver. Signal components at predetermined intermodulation frequencies are detected by a receiver circuit within the surveillance system that has a passband excluding signal components at the two predetermined surveillance frequencies. Since signals at the intermodulation frequencies are present only when a target receiver is presents detection is accomplished without the necessity of distinguishing between signals reflected from a target receiver and signals reflected from other obstacles.

REFERENCES:
patent: 3660844 (1972-05-01), Potter
patent: 3706931 (1972-12-01), Subramanian
patent: 3725917 (1973-04-01), Sletten et al.
patent: 3732567 (1973-05-01), Low et al.
patent: 3842418 (1974-10-01), Lorber
patent: 3922676 (1975-11-01), O'Berry et al.
patent: 3943515 (1976-03-01), Miley
patent: 4017855 (1977-04-01), Buck et al.
patent: 4031535 (1977-06-01), Isbister

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